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+%
+% schlange.tex
+%
+% (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
+%
+\documentclass[tikz]{standalone}
+\usepackage{times}
+\usepackage{amsmath}
+\usepackage{txfonts}
+\usepackage[utf8]{inputenc}
+\usepackage{graphics}
+\usetikzlibrary{arrows,intersections,math,calc}
+\usepackage{ifthen}
+\begin{document}
+
+\newboolean{showgrid}
+\setboolean{showgrid}{false}
+\def\breite{4}
+\def\hoehe{4}
+\def\a{47}
+\def\r{3.3}
+\def\skala{0.95}
+
+\begin{tikzpicture}[>=latex,thick,scale=\skala]
+
+\begin{scope}[xshift=-7.4cm,yshift=-1.2cm]
+ \clip (-3.6,-2.2) rectangle (3.6,5.1);
+
+ \fill[color=blue!20] (0,0)
+ -- ({180-\a}:{0.4*\r}) arc ({180-\a}:180:{0.4*\r})
+ -- cycle;
+ \node[color=blue] at ({180-\a/2}:{0.3*\r}) {$\vartheta$};
+
+ \fill[color=blue!20] (0,{\r/sin(\a)})
+ -- ($(0,{\r/sin(\a)})+({270-\a}:{0.3*\r})$)
+ arc ({270-\a}:270:{0.3*\r})
+ -- cycle;
+ \node[color=blue] at ($(0,{\r/sin(\a)})+({270-\a/2}:{0.2*\r})$)
+ {$\vartheta$};
+
+
+ \draw (0,0) circle[radius=\r];
+ \draw[->] (0,-3.0) -- (0,5);
+ \draw ({-\r-0.2},0) -- ({\r+0.2},0);
+ \fill (0,0) circle[radius=0.06];
+
+ \draw (0,0) -- ({180-\a}:\r);
+ \node at ({180-\a+3}:{0.65*\r}) [above right] {$1$};
+
+ \draw[color=red,line width=1.4pt]
+ ({180-\a}:\r) -- (0,{\r/cos(90-\a)});
+ \fill[color=red] ({180-\a}:\r) circle[radius=0.08];
+ \fill[color=red] (0,{\r/cos(90-\a)}) circle[radius=0.08];
+ \node[color=red] at (-1.0,3.7) [left] {$r=\cot\vartheta$};
+ \node[color=red] at ({180-\a}:\r) [above left] {$P$};
+ \node[color=red] at (0,{\r/sin(\a)}) [right] {$Q$};
+\end{scope}
+
+% Povray Bild
+\node at (0,0) {\includegraphics[width=7.6cm]{schale.jpg}};
+
+% Gitter
+\ifthenelse{\boolean{showgrid}}{
+\draw[step=0.1,line width=0.1pt] (-\breite,-\hoehe) grid (\breite, \hoehe);
+\draw[step=0.5,line width=0.4pt] (-\breite,-\hoehe) grid (\breite, \hoehe);
+\draw (-\breite,-\hoehe) grid (\breite, \hoehe);
+\fill (0,0) circle[radius=0.05];
+}{}
+
+\node[color=red] at (-1.4,1.4) {$r$};
+\node[color=red] at (-2.2,-0.2) {$P$};
+\node[color=red] at (0,3.3) [right] {$Q$};
+
+\end{tikzpicture}
+
+\end{document}
+